C# basic compression and decompression services.

To compress and decompress a data it is suggested to use class DefalteStream or GZipStream

using System.IO;
using System.IO.Compression;

namespace zip_usage
{
    class Program
    {
        static Stream CreateCompressStream(Stream inputStream, CompressionMode compressionMode)
        {
            //return new GZipStream(inputStream, compressionMode, true);
            return new DeflateStream(inputStream, compressionMode, true);
        }
        static void Main()
        {
            string inputFileName = @"..\..\Data\inputData.bin";
            string compressedFileName = @"..\..\Data\compressedData.zip";
            string resultFileName = @"..\..\Data\outputData.bin";

            byte[] inputBuffer = File.ReadAllBytes(inputFileName);
            using (FileStream outputStream = File.OpenWrite(compressedFileName))
            {
                using (Stream compress = CreateCompressStream(outputStream, CompressionMode.Compress))
                {
                    compress.Write(inputBuffer, 0, inputBuffer.Length);
                }
            }

            byte[] resultBuffer = new byte[inputBuffer.Length];
            using (FileStream compressedStream = File.OpenRead(compressedFileName))
            {
                using (Stream decompress = CreateCompressStream(compressedStream, CompressionMode.Decompress))
                {
                    decompress.Read(resultBuffer, 0, resultBuffer.Length);
                }
            }

            File.WriteAllBytes(resultFileName, resultBuffer);
        }
    }
}

Additional Links: System.IO.Compression Namespace